用 struct

用 struct

#include<bits/stdc++.h>
using namespace std;
#define int long long
struct qqq{
    int n;
    int m;
    int id;
}a[10];
bool cmp(qqq x,qqq y){
    if(x.m!=y.m){
        return x.m<y.m;
    }else {
        return x.n<y.n;
    }
}
signed main(){
    for(int i=1;i<=4;i++){
        cin>>a[i].n;
        a[i].id=i;
    }
    for(int i=2;i<=4;i++){
        a[i].m=abs(a[1].n-a[i].n);
    }
    sort(a+2,a+1+4,cmp);
    cout<<a[2].n;
    return 0;
}